Leather skiver



Feb. 8,- 1949. o. E. ZAHN LEATHER SKIVER Filed April so, 1948 0 T T0 6'. ZAH/v. IN V EN TOR.

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Patented Feb. 8, 1949 UNITED STATES ZAtlAZ LEATHER SKIVER Otto E Zahn, Penn Township, St. Joseph County, Ind.

Application April 30, 1948, Serial No. 24,219

Claims.

This invention relates to improvements in leather skivers, and more particularly to a device by means of which the leather at the shank or instep portion of a shoe may be skived preparatory to the operation of applying a half sole to a shoe for repair purposes.

The primary object of the invention is to provide a device of this character which is novel. simple in construction, easy to operate, and which reduces to a minimum any likelihood of damage to the shoe incident to the performance of the skiving operation.

A further object is to provide a device of this character wherein theparts are so constructed and arranged that the part of the shoe sole or shank which is to be skived need be deflected or bent from its normal position only to a small ex tent, and in which positive means are provided for feeding the part to be skived past a skiving cutter.

A further object is to provide a device of this character having opposed work engaging means shiftable, one relative to the other. and adapted to accommodate therebetween work pieces or shoe sole parts of different thicknesses, and wherein said parts cooperate by positive gripping action upon the sole part to advance the same in a predetermined path relative to the skiving blade.

A further object is to provide a device of this character wherein one work engaging part is shiftable relative to another, and the shiftable part has connected therewith a portion of a blade carrier mounting a skiving blade so that as the shiftable part moves from one position to an- Z? other, the angular positioning of the blade with respect to the work is adjusted automatically in a manner compensating for an adjustment and shifting of the movable part.

Other objects will be apparent from the following specification.

In the drawing:

Fig. 1 is an end view of the device.

Fig. 2 is a side view of the device with parts broken away.

Fig. 3 is a fragmentary detail sectional view taken on line 3-3 of Fig. 2.

Referring to the drawing, the numeral Ill designates a standard of rigid construction which is mounted upon and preferably formed integrally with a base plate 12. A platform I4 is mounted upon the standard ill and projects laterally therefrom. As best illustrated in Fig. 2, the frame is substantially of c-shape.

A housing I6 is mounted upon the platform M serrated or toothed peripheral surface '40.

2 to project therebeyond, the base l8 of said housing bearing upon the platform and being secured thereto. The housing includes rear bracket portions which journal a shaft 22. The forward or projecting part of the housing I6 is of hollow or chambered construction and terminates at its forward end in a vertical plate 24 having a dovetailed groove 26 extending vertically and open at its outer face. The plate 24 preferably projects above the housing l6 and at an intermediate portion thereof is provided with a forwardly projecting plate 28 which may have an upwardly projecting lug 30 mounted thereon or formedintegrally therewith.

The shaft 22 mounts a hand wheel 32 at one end, and said hand wheel has a crank handle 34 gles to the shaft 22 and journaled in suitable bearings (not shown) provided in the housing l6. Theshaft 38 projects forwardly beyond the front wall 24 and mounts thereon a cylinder having a A bevel gear 42 is fixedly secured to the shaft 38 intermediate the length of said shaft and rearwardly of the cylinder 40. As here illustrated this gear extends into an opening 44 which is formed in the front housing wall 24 to accommodate and receive it. The forwardly projecting portion 46 of the base l8 of the housing I6 journals an upright shaft 48 mounting a bevel gear 50 which meshes with the bevel gear 42 and is driven thereby. The shaft 48 also preferably mounts a gear or pinion 52 bearing upon a spacer 54 which in turn bears upon the base plate 46. The gear 52 is of large diameter and preferably passes through a cut-out 56 formed in the lower end of the front wall 24;

A plate 60 is provided with beveled edges which fit slidably in the dovetailed slot 26 of the plate 24 for vertical guided movement therein. The

,plate 60 is provided with a cut-out 62 through which the projection 28 on the frame plate 24 may pass. The upper end of the plate 60 is pro:

rection, said movement being limited by the engagement of the bottom edge of the cut-out 52 with the bottom surface of the projection is which passes therethrough. The plate 63 is provided with a vertically elongated or oval opening la: formed therein and adapted for free movement around and relative to the shaft 35 and the gear 42. The lower end of the plate iii! carries a forwardly horizontally projecting rigid guide plate. The outer free edge portion of this plate or support 12 includes an upwardly projecting track portion 14. The plate 12 projects laterally beyond the plate 68 and the housing of the device to provide an elongated transversely extending guideway, and the track it extends longitudinally of said guideway.

A plate '56 is mounted slidably upon the slide plate 12 and has a groove in its bottom face into which the track '54 projects. The rear por tion of this plate 16 mounts a depending rack 18 which is adapted to mesh with the pinion or gear 52. The plate is includes an upright portion Bil which bears against the front or outer surface of the plate 613 and is positioned between said palte and the cylinder 59. The upper horizontal surface of the plate I6 is serrated at 82.

As best illustrated in Fig. 3, a plate 84 is secured to the face of the plate 533 and projects laterally therefrom in slidable bearing engagement with the plate 24 at the side of the frame l6 opposite that at which the hand wheel 32 extends, and a lug or car 86 is pivoted thereto. This lug or ear is carried by a plate #38 projec ing forwardly from the frame to one side of and clear of the cylinder 40 and has 2. lug or ear 90 formed at its forward end. A bracket 92 is secured to the side wall of the casing is in spaced relation above the plate 38 and terminates in an outer end portion upon which bosses 9d are wand. A suitable hinge pin as passes through the ljpsses 90 and 94 to pivotally connect the plate'tll directly to the frame 16. Thus as the plate 60 slides up and down. the rear end of the plate 88, whose lug 8& is pivotally connected to the plate extension 84 of the plate 62, moves up and down as accommodated by the pivot mounting 9B of said plate 88 at its forward end. Thus the angle of the plate 88 relative to the horizontal varies with the vertical adjustment of the plate 60, said angle being such that in the normal position of the parts, said plate is it inclined as seen in Fig. 2. The plate 83 carries the blade 98 which projects inwardly therefrom in a direction of the cylinder 4% to terminate adjacent to said cylinder in a position therebelow, as best seen in Fig. l.

The construction and arrangement of the parts, as best illustrated in Fig. 2, entails a termination of the housing part 56 in inwardly spaced relation to the outer end of the housing, and termination of the plate '18 in inward spaced relation to the slidable member 76, so that the bottom edges of all the parts extend at only a slight angle to the horizontal. This arrangement has the advantage that a shoe, as illustrated by numeral I60, having a sole portion H32 and a shank sole portion i534, which is to be skived to accommodate the application of a half sole (not shown) may be positioned as illustrated in dotted lines in Fig. 2 with only'a slight bending of the shank portion 36 out of the plane of the sole portion from which it projects required to accommodate the skiving action. Stated differently, the inclination Or -forward upward tapering of the bottom edges of the various parts of the device is at such a small angle to the 1 upon these respective parts.

be mounted upon the shaft 43 to avoid play horizontal that the shoe shank Hi5 need only be inclined or tilted at a slight angle to introduce the shank portion Gilt into he skiving position. Q'oserve also that the G-shape of the frame Hl, l2, i l permits the toe portion of the shoe to eX- tend through said frame without interference from the frame.

When the shoe is positioned as illustrated in Fig. 2, its shank I85, having been loosened from the sole, is slid onto the upper serrated surface 82 of the plate 16 to the right of the cylinder 4E5 as viewed in Fig. 1. When these parts have been properly positioned, rotation of the hand wheel 32 by its crank 3d will drive the shaft 38 to rotate the cylinder t8. Simultaneously the gear or pinion 52 will be rotated with the shaft 38 through the gears t2 and 5i. i ie rotation of the gear 52 is transmitted to the rack 78 upon the plate 75 to cause the plate 'lii to have a linear movement upon the guide plate l2 and the track id thereof. When the edge of the shoe shank Hit engages the cylinder at incident to the movement of the plate Hi, the cylinder 40 serves to impart a downward pressure through said shoe shank upon the plates 76 and i2. The plate 12 being formed integrally with or carried by the plate 69 transmits downward pressure to the plate 5% against the action of the spring 68. Observe in this connection that the serrations 52 upon the carrier plate 16 and upon the periphery of the cylinder 40 will insure against slippage of the shank its relative to these moving parts inasmuch as the application of pressure by these parts will cause the serrations to site into the leather. As the rotation of the hand wheel 32 continues, the shank H3 3 and the shoe it are moved laterally in the direction parallel to the track M, and the shank is forcibly fed into engagement with the cutting edge of the knife blade 93. This movement continues until the shank completely traverses the blade so that the blade uniformly splits or cuts said shank on a taper.

It will be observed that inasmuch as the inclination of the plate 88 is controlled from the plate 50, the angle at which the bladest is p0- sitioned will vary for different thicknesses of leather. In other words, the carrier plate 16 is positioned at an elevation with reference to a horizontal plane tangent to the lowermost peripheral point of the cylinder Ml, depending upon the thickness of the leather. Thus for each given thickness of the shank I54 there will be automatic compensation or adjustment of the angle of the blade 95. For this purpose the rack 18 depending from the carrier plate 16 is of greater vertical dimension than the width of the horizontally positioned gear 52 so that said rack may slide up and down with reference to said gear without interfering with the -mesh of the teeth Thus the gear 52 thereof lengthwise on said shaft and to avoid further any movement of the gear 59 which might tend to interfere with the continued meshing engagement of the gear 53 with the gear 42.

It will also be understood that the gears are to related and proportioned that the peripheral rotation of the gear 52 will be the same as the peripheral rotation of the cylinder 48 so as to cause the carrier plate 56 to be advanced at the same linear rate that the periphery of the cylinder to is advanced. This can be accomplished hy'sel'ecting a gear 52 whose mean pitch diameter is equal to the diameter of the cylinder 40 in enemas casesnvhere ;the*gears 42 and-*SD aremf *the same size. Alternativelyg the' gear 52"may be made either, smaller; or larger than the cylinder, ifi il. the ratio'between the gears izandtfl 'is :such as to.',.'comp ensate. forth'e difference in ,sizebetween the gear bland, the cylinder ,40 in a manner to producethe same rate. ofllhieartravel of them-- riphery of the. roller All and the ,bodilymcvement .Offthe lcarrier plate .182 mentioned 'jabove.

While, an automatic adjustment of the, angle cfthe sk iving "blade-with reference to the work piece occurs the manner described above, it willb'e' apparentalso that a further change in the setting of-th'ese -parts-may-*be provided by adjusting the vertical position of the plate 84 upon the plate 80, which can be accomplished by any suitable means, such as an elongated pin and slot connection (not shown) between the plates 84 and 60.

The device serves its intended purpose efficiently, permits a uniform skiving cut to be formed in the leather of the shank by a simple operation with any suitable power amplification required provided by the gear ratios in the device. shoe by hand has heretofore been a time-consuming operation and one in which uniformity has not been secured. The instant construction will assure such uniformity, will reduce the amount of time required for the operation, and

at the same time will avoid any excessive bending of the shank, and can be accomplished by a single worker who holds the shoe in desired posi tion in one hand and turns the crank with his other hand.

While the preferred embodiment of the invention has been illustrated and described herein, it will be understood that changes may be made in the construction within the scope of the appended claims without departing from the spirit of the invention. v

I claim:

1. A. leather skiver comprising a frame, a work feed roll rotatable on said frame, a guide shiftable vertically on said frame, spring means urging said guide upwardly; a carrier slidable on said guide in a path below said feed roll and transverse of the axis of said feed roll, actuating means for rotating said roll and advancing said carrier simultaneously and at the same linear speed,

a skiving blade carried by said frame adjacent and above the path of said carrier with its cutting edge transverse of said path and adjacent to said feed roll.

2. A leather skiver comprising a frame, a work feed roll rotatable on said frame, a guide shiftable vertica ly on said frame, spring means urging said guide upwardly, a carrier slidable on said guide in a path below said feed roll and transverse of the axis of said feed roll, actuating means for rotating said roll and advancing said carrier simultaneously and at the same linear speed, and a skiving blade unit positioned adja cent and above the path of said carrier and having a cutting edge adjacent to said roller, means nivotally connecting one side of said unit to said frame and means pivotally connecting the other side of said unit to said guide.

3. A leather skiver comprising a frame, a work feed roll rotatable on said frame, a guide shiftable vertically on said frame, spring means urging said guide upwardly, a carrier slidable on said guide in a path below said feed roll and transverse of the axis of said feed roll, actuating means The operation of skiving the shank of a 6, forrotating;said-*rcll"and advancing: saidicarrie'n simultanecusly and'at the same linear speedaand alaterally" tiltaibie slaving-blade unit pivdtally carried by said' frame'and connectedto said-guide; tobe tilted-as said guideshiftsuif A-leather skiver' comprisinga frame, a work roll rotatable on said frame-,a guide shiftable' vertically on" saidframe; spring means urg-ing guide-upwardly; a carrier-slidable orrsaid guide in apath below said feed, roll and trans=y verseof the axis'of said feedroll,actuating'means' for rotatingfsaidyroll" and"; advancing said carrier simultaneously and at'the same linear speed; and a skivingblade carried by, said frame adjacent and above the path of said carrier with its cutting edge transverse ofsaid path and adjacent to said feed roll, said guide having a horizontal portion projecting therefrom and provided with a rib portion engaged by and defining a guide track for said carrier.

5. A leather skiver comprising a frame, work advancing means carried by said frame and ineluding a rotatable member and a reciprocable member, means for simultaneously actuating said members at the same rate of linear travel, and a skiving tool carried by said, frame and having a cutting edge confronting the space between said members.

6. A leather shiver comprising a frame, work advancing means carried by said frame andineluding a rotatable member and a reciprocable member, means for simultaneously actuating said members at the same rate of linear travel, and a skiving tool carried by said frame and having a cutting edge confronting the space between said members, said frame being recessed rearwardly adjacent and immediately below said reciprocable member to fully receive the toe portion of a shoe in a position whereby the shank of the sole of the shoe may be positioned between said members in position to be skived.

'7. A leather skiver comprising a frame, work advancing means carried by said frame and including a rotatable member and a reciprocable member, means'for simultaneously actuating said members at the same rate of linear travel, and a skiving tool carried by said frame and having a cutting edge confronting the space between said members, said reciprocable member being shiftable bodily toward and from said rotatable memher in a direction transverse of its reciprocatory movement, and resilient means pressing said reciprocable member toward said rotatable member.

8. A leather skiver com rising a frame, work advancing means carried by said frame and including a rotatable member and a reciprocable member, means for simultaneously actuating said members at the same rate of linear travel, and a skiving tool carried by said frame and having a cutting edge confronting the space between said members, and a guide shiftable on said frame transverse of the path of movement of said reciprocable member, said guide supporting said reciprocable member, said skiving tool being pivotally connected to said frame and to said guide to be positioned by said guide.

9. A leather shiver comprising a frame, a shaft jc-urnaled in said frame, a cylindrical member mounted on said shaft, a vertically shiftable member guided by said frame and including a horizontal portion underlying said cylindrical member, a carrier slidable on said horizontalportion in a path perpendicular to the shaft and including a rack, a gear meshing with said rack and driven by said shaft, means for rotating said shaft, and a skiving tool carried by said frame and connected to said vertically shiitable member and having a cutting edge tilted relative to the horizontal and to the axis ofsaid cylindrical member and confronting and adjacent to the passage between said cylindrical member and said carrier.

10. A leather skiver comprising a frame, a shaft journaled in said frame, a, cylindrical member mounted on said shaft, a. vertically shiftable member guided by said frame and including a horizontal portion underlying said cylindrical member, a carrier slidable on said horizontal portion in a path perpendicular to the shaft and including a rack, a gear meshing with said rack and No references cited. 

